Demise Deck

Hello, I would like some tips on better utilizing this deck. I'm open for harsh critiques and such.

Monsters:19
Demise x2
Manju x3
Senju x2
Sonic Bird x2
Doom Doozer
Insect Knight x2
Metal Armored Bug
Great Maju Garett x2
Sangan
Djinn Cursencaster of Rituals
Djinn Presider of Rituals

Spells:17
Monster Reborn
End of the World x2
Advance Ritual Art
Pot of Avarice
Book of Moon
Foolish
Lightning Vortex
Dark Hole
Gold x2
Book of Moon x2
Giant Trunade
Megamorph
Magical Mallet x2
Swing of Memories

Traps:4
Bottomless x2
Torrential
Mirror Force

I also need suggestions for a side deck if possible. Thank you in advance.

Don't like the build try not to use the insect engine its old use 3 warewolf's 2000 atk normal monster use 3 ancient gadjiltron use 3 geartown lol no mst ? (use 2 space typhoon) use 2 cylinders use trade-in and barbaros use call of the haunted you think of the rest btw take out sonic bird and use only 3manju and 2 senju

Here is my updated Demise Deck.

Monsters: 17
Demise x2
Manju x3
Senju x2
Gene-Warped Werewolf x3
Great Maju x2
Ancient Gear G Dragon x2
Beast King Barbaros x3

Spells: 20
Terraforming
Gear Town x2
Advance Ritual Art
End of the World x2
Monster Reborn
Magical Mallet x2
Trade-in x2
Pot of Avarice
Pot of Benevolence
Book of Moon x2
Dark Hole
Giant Trunade
MST x2
Lighting Vortex

Traps: 3
Royal Decree x3

You should definetely use 3 geartown 3 trade in 3 gadjiltron take out 1 senju bird and 2 great maju remove the 2 mallets add marshmallon for stalling and spirit reaper or morphing jar or sangan or all 3 remove pot of benevolance or what was its name have you thought of pot of duality?

I'm not sure what to take out for Ancient Gear D Dragon.

Monsters: 17
Demise x2
Manju x3
Senju x1
Gene-Warped Werewolf x3
Marshmallon
Spirit Reaper
Sangan
Ancient Gear G Dragon x2
Beast King Barbaros x3

Spells: 20
Terraforming
Gear Town x3
Advance Ritual Art
End of the World x2
Monster Reborn
Trade-in x3
Pot of Avarice
Pot of Duality
Book of Moon x2
Dark Hole
Giant Trunade
MST x2
Lighting Vortex

Traps: 3
Royal Decree x3

Ok here is how my demise looks
Monsters:20
2-demise
3-manju
2-d.d lady
1-marshmallon
1-jar
3-ancient gear gadjiltron
3-barbaros
3-gene-warped
2-commander(tuner)

Spells 16:
3-geartown
1-reborn
2-space
1-advance ritual art
2-contract with the abyss
1-swords
3-trade-in
1-e-teleport
1-trunade
1-terraforming


Traps:6
1-mirror
1-torrential
1-call
3-reckless greed

Dark hole in side